Pulley attachment for tractors



Dec. 22 J 1925.

1,566,924 R. w. ROBERTSON PULLEY ATTACHMENT FOR TRAGTORS Filed July 6, 1925 f lr ment for tractors.

PatentedDeic. 22, 1925.

y UNITED STATES 1,566,924 PATENT oFFicE.

i RICHARD W. ROBERTSON, OF PLYMOUTH, WISCONSIN, ASSIGNOR TO PLYMOUTH FOUNDRY & MACHINE COMPANY, 0F PLYMOUTH, WISCONSIN, A CORPORATION OF WISCONSIN.

l PUIILEY ATTACHMENT FOR TRACTORS.

Applicationv led July 6, 1925. Serial- N0. 41,826.

fo all whom t may concern:

Be it known that I, RICHARD lV. ROBERT- soN, a citizen of the United States, and resident of Plymouth, in the county of Sheboygan and State of Wisconsin, have invented certainl new and useful Improvements in Pulley Attachments for Tractors; and I do hereby declare that the following is a full, clear, and exact description thereof. Y

This invention relates to" pulley attachf lar parts regularly found upon tractors of certain types, such for instance as those known as Fordson tractors, although the invention is applicable to other types of tractors.

Further objects are to provide an attachment for tractors for controlling the driving or power pulley, which has a novel oil.

ing system, which is so constructed thatthe oil will notleak from the system under nor-V mal conditions, nor will it leak even though the tractor is tilted downwardly `towards the pulley side, and to, provide means associated with the belt' pulley control which permits axrelatively rapid circulationof oil in the device while the gears are in operative engagement and which permits a gradual draining of the device when the gears are out of engagement.

An embodiment of the invention is shown in the accompanying drawings, in which:-

Figure 1 is a sectional view through the attachment and through a portion` of the tractor.

Figure 2 is a transverse sectional view on the line 2-2 of Figure 1.

Figure 3 is a bottom view of a portion of the attachment detached from its associated parts.

Referring to the drawings, it will be seen that the standard tractor housing is indicated at 1, and encloses the main shaft 2, such mainshaft being regularly provided with a bevel gear 3. Y

The attachment comprises an outer stationary sleeve 4 which is provided with a flange 5 adapted for attachment to the casing 1. The sleeve 4 projects into the casing nally machined portion 6 and with a similar inner internally machined surface 7. These surfaces 6 and 7 provide bearing surfaces for a slidably mounted inner sleeve 8 which is accordingly provided with machined surfaces, as illustrated in Figure 1, which slide within the surfaces 6 and 7. The stationary portions of the outer race 9 of ball bearings are rigidly carried by the inner sleeve 8 and the inner race or movable portions 10 are carried by the pulley shaft 11. An annular cap 12 closes the space between the pulley huh and the sleeve 8 and prevents loss of oil. The outer end ofthe shaft 11 is splined and receives the standard pulley 13, such pulley being locked in place by means of a nut 14 screwed upon a reduced threaded extension 15 of the shaft.

The inner end of the shaft carries a bevel gear 16 adapted to mesh with the bevel gear 3.

The means for shifting the sleeve 8 may take any desired form. For instance, a plug 17 may be revolubly mounted'within a boss 18 formed in the stationary sleeve 4. This plug is retained in place by means of a groove -19 and retaining screw 20. It is adapted either for permanent or removable attachment to an operating crank 21. The lower end of the plug is provided with an eccentric pin 22 which cooperates with an aperture formed in the s1eeve'8 to shift the sleeve as the plug is rotated to 180.

A small boss 22 is provided on the upper outer end of the sleeve and preventsl the ,free feeding of oil'to these bearings while they are in operation, for it is well known that when the bearings are running the oil is dissipated to a certain extent. Thus loss of oil is guarded a ainst.

` The inner end o the sleeve 8 is provided with a pair of aperturesy 27 and 28, the aperture 27 communicating with a relatively short slot 29, and the aperture`28 communivready oiling of the ball bearings at the cating with a relatively long slot opening through the outer end of the sleeve 8, as most clearly shown in Figure 3. When the gears are in mesh, oil is splashed upwardly and also through the bearing at the inner end of the sleeve 8 and passes into such sleeve,'thus freely oiling the parts. However, the oil is returned through they-apertures 27 and 28, and the Vslots 29 and 30, it being noted that twopassageways are provided for' the return of the oil when tilegears are in mesh. When the sleeves 8 are moved to the right and the gears are thrown out of mesh, the short slot 27 vis closed by the stationary portion of the sleeve 4 and the oil is allowed to slowly drain through the aperture 28 and the elon ated slot 30. l

In order to Iprevent loss o oil due to the tiltingof the tractor downwardly towards the pulley side, a sleeve 31 is rigidly carried by meansv of an inwardly extended web or flange 32 preferably formed integrally with lthe movable inner sleeve 8. This sleeve 31 is spaced from the shaft 11 andmay contact, if desired, with the inner raceway l0 of the outer ball bearin Even if the tractor should suddenly tllt to the, side and the upper surface of the oil occupy a slanting position such upper surface would not pass beyond the dotted line indicatedat 33 Ain Figure 1', and consequently would not o tractor has been provided' which will ycontrol the operation of the belt pulley, and which is provided with a novel form of oiling means adapted to insure the adequate oiling of the parts, and also to effectively prevent loss of oil even under unusual conditions.

It will be -seen further that a very simple and serviceable type of attachment has been provided, which may be most easily constructed and readily assembled.

Although the invention has been described in considerable detail, it is to be understood that the invention may be variously embodied and is, therefore, to be limited only as claimed.

I claim:

1. The combination of a tractor provided with a casing, a drive shaft and a bevel gear carried by said drive shaft, and an attachment comprising a stationary sleeve ri idly carried by said casing, a movable s eeve slidably mounted within said stationary sleeve, means for sliding said movable sleeve inwardly or outwardly, ball `bearings carried adjacent the outer end of said movable sleeve, a pulley shaft mounted within said ball bearings and having a bevel gear 'at its inner end and power transmitting means at its outer end, means for oiling the outervof said ball bearings when said movable sleeve is slid outwardly, said movable sleeve hav-l ing means for returning oil to said casing in a greater volume when said movable sleeve is in its innermost position than when said movable sleeve is in its outermost position. 2. The combination of a tractor provided with a casing, a drive shaft and a bevel ygear carried by said drive shaft, and an attachment comprising' a stationary sleeve rigidly carried by said casing, a movable sleeve slidably mounted within said stationary sleeve, means for sliding said movable sleeve inwardly or outwardly, ball bearin carried adjacent the outer endof said movable sleeve, a pulley shaft mounted within said ball bearings and having a 1 bevel gear at its inner end and power transmitting means at' its outer end, means for oiling the outer of said' ball bearings when said movable sleeve is slid. outwardly, said movable sleeve having means for returning oil to said casing in a greater volume when said movable sleeve is in its innermost position than when said movable sleeve is in its outermost position, and a relatively' small sleeve rigidly carried. by said movable sleeve adjacent. its outer end, and surrounding said pulley shaft, the inner end of said last mentioned sleeve being spaced from the innermost of said ball bearings. A

In testimony that I claim the foregoing I have hereunto set my hand at Plymouth,

in the county of Sheboygan and State of Wisconsin RICHARD W. ROBERTSON., 

